W Oct. 1st
Topics: We solved problems from 1.7, 1.8. The angle between two lines is the angle beween their directions.Homework:Solve (for practice) by next lecture: 1.8: 8, 9, Examples 1.10, 1.11Write up the solutions and turn in for grading on Monday Oct. 6: 1.8: 10, 11, 12, 15 c,d